One of the deadliest mass shootings in American history took place in July 1984 at a San Ysidro McDonald’s.

Twenty two people were killed, included the suspect. There were also 19 people injured.

Charlie Minn is the director and producer of a new documentary named 77 Minutes. Minn said he created this film because he wanted to give the victims a voice and a platform for their stories to be heard.

Listen to the interview here and find out why the movie is named 77 Minutes: